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111 lines
4.7 KiB
C++
111 lines
4.7 KiB
C++
// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Copyright (C) 2018 Henner Zeller <h.zeller@acm.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation version 2.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://gnu.org/licenses/gpl-2.0.txt>
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#ifndef RGBMATRIX_PIXEL_MAPPER
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#define RGBMATRIX_PIXEL_MAPPER
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#include <string>
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#include <vector>
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namespace rgb_matrix {
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// A pixel mapper is a way for you to map pixels of LED matrixes to a different
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// layout. If you have an implementation of a PixelMapper, you can give it
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// to the RGBMatrix::ApplyPixelMapper(), which then presents you a canvas
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// that has the new "visible_width", "visible_height".
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class PixelMapper {
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public:
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virtual ~PixelMapper() {}
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// Get the name of this PixelMapper. Each PixelMapper needs to have a name
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// so that it can be referred to with command line flags.
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virtual const char *GetName() const = 0;
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// Pixel mappers receive the chain and parallel information and
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// might receive optional user-parameters, e.g. from command line flags.
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//
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// This is a single string containing the parameters.
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// You can be used from simple scalar parameters, such as the angle for
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// the rotate transformer, or more complex parameters that describe a mapping
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// of panels for instance.
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// Keep it concise (as people will give parameters on the command line) and
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// don't use semicolons in your string (as they are
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// used to separate pixel mappers on the command line).
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//
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// For instance, the rotate transformer is invoked like this
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// --led-pixel-mapper=rotate:90
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// And the parameter that is passed to SetParameter() is "90".
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//
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// Returns 'true' if parameter was parsed successfully.
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virtual bool SetParameters(int chain, int parallel,
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const char *parameter_string) {
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return true;
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}
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// Given a underlying matrix (width, height), returns the
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// visible (width, height) after the mapping.
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// E.g. a 90 degree rotation might map matrix=(64, 32) -> visible=(32, 64)
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// Some multiplexing matrices will double the height and half the width.
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//
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// While not technically necessary, one would expect that the number of
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// pixels stay the same, so
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// matrix_width * matrix_height == (*visible_width) * (*visible_height);
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//
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// Returns boolean "true" if the mapping can be successfully done with this
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// mapper.
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virtual bool GetSizeMapping(int matrix_width, int matrix_height,
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int *visible_width, int *visible_height)
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const = 0;
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// Map where a visible pixel (x,y) is mapped to the underlying matrix (x,y).
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//
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// To be convienently stateless, the first parameters are the full
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// matrix width and height.
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//
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// So for many multiplexing methods this means to map a panel to a double
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// length and half height panel (32x16 -> 64x8).
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// The logic_x, logic_y are output parameters and guaranteed not to be
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// nullptr.
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virtual void MapVisibleToMatrix(int matrix_width, int matrix_height,
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int visible_x, int visible_y,
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int *matrix_x, int *matrix_y) const = 0;
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};
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// This is a place to register PixelMappers globally. If you register your
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// PixelMapper before calling RGBMatrix::CreateFromFlags(), the named
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// PixelMapper is available in the --led-pixel-mapper options.
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//
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// Note, you don't _have_ to register your mapper, you can always call
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// RGBMatrix::ApplyPixelMapper() directly. Registering is for convenience and
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// commandline-flag support.
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//
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// There are a few standard mappers registered by default.
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void RegisterPixelMapper(PixelMapper *mapper);
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// Get a list of the names of available pixel mappers.
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std::vector<std::string> GetAvailablePixelMappers();
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// Given a name (e.g. "rotate") and a parameter (e.g. "90"), return the
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// parametrized PixelMapper with that name. Returns NULL if mapper
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// can not be found or parameter is invalid.
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// Ownership of the returned object is _NOT_ transferred to the caller.
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// Current available mappers are "U-mapper" and "Rotate". The "Rotate"
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// gets a parameter denoting the angle.
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const PixelMapper *FindPixelMapper(const char *name,
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int chain, int parallel,
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const char *parameter = NULL);
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} // namespace rgb_matrix
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#endif // RGBMATRIX_PIXEL_MAPPER
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